MHT CET202618 April 2026Morning ShiftPhysicsElectromagnetic InductionActual
The magnetic potential energy stored in a certain inductor is 49 mJ when the current in the inductor is 70 mA . The inductance of the inductor is
Options
- A0.20 H
- B2.0 H
- C20 H
- D200 H
Correct answer
C. 20 H
Step-by-step solution
The magnetic potential energy stored in an inductor is given by: U = 1 2 L I^2 Rearranging for inductance L : L = 2U I^2 Substituting the given values U = 49 10⁻³ J and I = 70 10⁻³ A : L = 2 49 10⁻³ (70 10⁻³)^2 L = 98 10⁻³ 4900 10⁻⁶ L = 98 10⁻³ 4.9 10⁻³ L = 20 H Answer: 20 H